Development of the network between 2007 and 2020 is expected to cost around 3·2bn dinars, and the government hopes that much of the funding can be obtained in the form of soft loans. It has approached JBIC to help fund the civil engineering work, tracklaying, electrification and signalling, plus the purchase of a fleet of double-deck trains. By far the biggest single element would be the purchase of a fleet of 55 trainsets, each formed of two five-car EMUs

I think the water is never a problem anymore, especially with the new technologies. In London the Metro and many underground tunnels cross under the river in many points, the channel tunnel between France and England is under the sea.

Algiers is mountainous city, and it is very humid u dig just few meters and u r in trouble with water, I was there when they where digging the water was everywhere, some stations in Algiers metro are under the level of the sea and just few meters from the costs.

The water problem is not a big deal any more with the new tech. but it can add to the costs of the projects.